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URLBUT. R TUBE Patented Deo. 2, 1890.

UNITED STATES PATENT OFFICE.

DANIEL N. HURLBUT, OF NE7 YORK, N. Y.

PAPER TUBE.

SPECIFICATION forming part of Letters Yatent No. 441,846, dated December Q 1890.

Application iilecl July 5, 1889. Serial No. 316,602. (No model.)

To all whom it may concern:

Be it known that I, DANIEL N. HUELBUT, acitizen of the United States, residing in the city, county, and State of New York,have invented a new and useful Paper Tube, of which the following is a specification.

-My invention has reference especially to tubes made of paper 0r fibrous material, they being especially adaptable, by reason of the cheapness ot the material, for electrical conduit-s for electric-light and otherwires, for the manufacture of speaking tubes, dite.

The object of my invention is to provide a paper tube which shall resist ordinary crushing strains, and which shall be capable of use in lengths without danger of breaking. Such a tube is shown in the accompanying drawings, in. which- Figure 1 is an elevation of a length of the completed tube; Fig. 2, a similar view showing at one end the Wrappings unwound from the core, and Fig. 3 an end view.

a is the core of the tube, which is preferably a fillet of paper bent into acylinder With the seam formed either by the edges of the fillet abutting, as shown at l), Figs. 2 and 3, or by slightly overlapping, the co're thereby having, except where theoverlap is made when that character of seam is used, a single thickness of wall.

c is a Wrapping, preferably of the same inaterial as the core d, applied to the core spirally and secured thereto by a suitable paste or cement.

d is another wrapping, also preferably of the same material as the core a, applied to the Wrapping c spirally, so as to break joints therewith and secured thereto by a suitable paste or cement.

I do not deem it necessary in all cases to use more than one spiral wrapping for the core a, one wrapping being sufficient to preserve the core in tube formation, and the sec 0nd Wrapping being applied to secure additional strength. A third or other wrappings may be applied for the same purpose.

The tube above described may be made by hand or by machinery. In an application tiled by me, Serial No. 316,601, I have described a machine adapted to produce such tube in quantities, and such machine I prefer to use.

The tube herein shown and described withstands crushing to such an extent that it is not liable to collapse and lose its tubular form, and it is not liable to break, when used in lengths, from its own weight 4or any ordinary Weight which it may be called upon to carry. y

While I regard the tube when made of paper as the better construction, because more economical, I do not limit myself to a paper tubing, as metal might be used without departing from my invention.

What I claim is- 1. In a tube, the combination of a cylindrical core formed from a single thickness of material and having an abutting or slightlyoverlapped seam, said core being covered throughout by a spirally-wound tape, substantially as described.

2. In a paper tube, the combination of a cylindrical core formed from a single th`ickness of paper and having an abutting or overlapped seam, tapes of the same material spirally wound about said core and breaking joints, and an adhesive material to bind said core and tapes, substantially as described.

This specification signed and witnessed this 25th day of June, 1889.

DANIEL N. llURLBUT.

Witnesses:

D. I'I. DRIseoLL, "WILLIAM PELZER. 

